1.备份：
备份通常会建议您的数据重复。启动备份时，它会生成您的文件副本，包括与您的网站和邮箱相关的文件。这些副本通常保存在与原始内容不同的位置，因此非常适合灾难恢复。备份是一种可能需要几分钟、几小时或几天才能完成的机制，具体取决于数据。这表明备份结束时的数据可能与备份启动时的数据不兼容。备份计划存储很长时间，如果它们存储在服务器之外，它们可用于在服务器故障后恢复服务器。
2. 快照：
快照是指在特定时间段内您的服务器文件系统的即时“图片”。这张图片包含整个文件系统，就像拍摄快照时一样。当快照习惯于恢复服务器时，服务器将恢复到快照时的状态。快照专为短期存储而设计。当空间耗尽时，新快照最终会覆盖旧快照。出于这个原因，快照通常只有在您想恢复到服务器的最新版本时才有用。
备份和快照的区别：
| S.NO. | Backup | Snapshot |
|---|---|---|
| 1. | Backup can be stored in another location, same server, or even the same drive in this case. | Snapshots can be stored only in the same location where original data is present. |
| 2. | Backup may have differences based on when the backup started and ended. | Snapshot is a “picture” of your server at present period of time. |
| 3. | It is a long term process and might take a lot of time to complete the procedure. | It is a short term process and takes very less time, as compared to backup, to complete the procedure. |
| 4. | Backup comprises of only file system. | Snapshots comprises of different types of systems like the files, software, and settings of that type. |
| 5. | Backup takes long time to copy data. | Snapshot takes very less time to copy the data. |
| 6. | Incase of SQL server, backup is a paid service. A person can use this service to automatically backup most recent data every night. | Incase of SQL server, snapshot is a free feature that is used to manually create duplicate images of the servers. One can easily generate them at any time. |
| 7. | Backup is not a backup unless the data exists in several distinct locations. Backups should be easily and quickly restored. Backups should be verifiable. | Snapshot by itself is not a backup. But it can be used as an essential part of the backup process. Snapshot is used as a part of the data movement process to a backup file. It is removed when the backup job is completed. |